package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 过滤器，检查用户是否已经完成登录
 */

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response =(HttpServletResponse) servletResponse;

        //1.1获取此次请求的url路径：requestURI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求{}：",requestURI);//日志

        //1.2设置不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2.判断本次请求是否需要处理（检查登录状态）
        boolean check = check(urls, requestURI);
        if (check){
            //3.不需要处理，则直接放行
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }//4.1判断登录状态，如果已经登录则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurentId(empId);
            //已经登录，放行
            filterChain.doFilter(request,response);
            return;
        }
        //4.2判断登移动端用户录状态，如果已经登录则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurentId(userId);
            //已经登录，放行
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //未登录，跳转到登录页面，通过输出流方式，向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param requestURL
     * @return
     */
    public boolean check(String[] urls,String requestURL){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURL);
            if (match){
                return true;
            }
        }
        return false;
    }
}
